Lubricating grease for gate hoist bearing and preparation method thereof

Abstract

The invention discloses lubricating grease for a gate hoist bearing and a preparation method of the lubricating grease. The lubricating grease comprises the following raw materials in percentage by mass: 60-85% of degradable vegetable oil, 8-15% of a thickening agent, 5-8% of a waterproof agent, 2-4% of an antioxidant and antiwear agent and 1-3% of an antirust agent. The prepared lubricating grease for the gate hoist bearing has high biodegradation rate, excellent waterproof performance and good antioxidant and antiwear performance, and can better meet the use requirements of the gate hoist bearing for the lubricating grease.

Description

Technical Field

[0001] The invention relates to lubricating grease for a gate hoist bearing and a preparation method thereof. Background Art

[0002] In order to control and allocate natural surface water and groundwater, develop and utilize water resources more rationally, and effectively regulate and distribute water, the construction of water conservancy projects has become a means of resource utilization in the long term. As an indispensable equipment in water conservancy projects, the safety of the gate hoist is related to the normal operation of hydraulic structures, the utilization rate of water resources and the safety of the water environment. Bearings, as key components connecting the hoist and the gate, are crucial to fully realizing the benefits of the project. Due to long-term exposure to the atmosphere or immersion in water and complex forces, the bearings of the gate hoist often produce pits and grooves, which are particularly serious in dry-wet alternating areas with serious water pollution. Therefore, it is very important to select suitable bearing grease to increase protection.

[0003] At present, the bearing grease used in outdoor environments on the market can withstand the erosion of rainwater during use, but it does not meet the requirements of long-term immersion and erosion in large amounts of water. The degree of change in water and corresponding tests are rarely considered during the product development process. Therefore, when the product is coated on the bearing, bubbles and shedding often occur when immersed in water, causing large-scale rust and failure of the bearing. In addition, the harmful substances contained in ordinary grease will pollute the water body and cause harm to the environment. In order to better meet the use requirements of gate hoist bearings, the adaptability and environmental protection of the product in water should be better considered during the development of gate hoist bearing grease, and corresponding performance tests should be carried out to ensure the good performance of the product. Summary of the invention

[0004] In order to at least partially solve the above technical problems and better meet the use requirements of gate hoist bearings, the present invention provides a biodegradable grease product that can adapt to water environments.

[0005] As one aspect of the present invention, it relates to a grease for a bearing of a gate opening and closing machine. The grease, calculated by mass percentage, comprises the following constituent raw materials: 60-85% of degradable vegetable oil, 8-15% of a thickener, 5-8% of a waterproofing agent, 2-4% of an antioxidant and anti-wear agent, and 1-3% of a rust inhibitor.

[0006] In one or some preferred embodiments, the kinematic viscosity of the degradable vegetable oil at 100°C is 60-80 mm 2 / s.

[0007] In one or some preferred embodiments, the degradable vegetable oil is selected from one or more of castor oil, soybean oil or cottonseed oil.

[0008] In one or some preferred embodiments, the thickener is organic calcium carboxylate.

[0009] Furthermore, the organic calcium carboxylate is selected from 12-hydroxy calcium stearate and / or calcium stearate.

[0010] In one or some preferred embodiments, the waterproofing agent is a high molecular polymer.

[0011] Furthermore, the high molecular polymer is selected from polyisobutylene and / or polymethacrylate.

[0012] In one or some preferred embodiments, the antioxidant and antiwear agent is molybdenum o-hydroxybenzoate with a long-chain alkyl group.

[0013] Furthermore, the long-chain alkyl group is selected from C8 to C 20 of alkyl.

[0014] In one or some preferred embodiments, the rust inhibitor is an ester rust inhibitor.

[0015] Furthermore, the ester rust inhibitor is selected from one or more of pentaerythritol monooleate, sorbitan monooleate or polyol ester.

[0016] As another aspect of the present invention, it relates to a method for preparing the above-mentioned gate hoist bearing grease, comprising the following steps:

[0017] S1. Weigh each substance according to mass percentage, mix the degradable vegetable oil and the thickener in sequence, heat and stir to obtain material 1;

[0018] S2, cooling and shearing the material prepared in S1, and then sequentially adding a waterproofing agent, an antioxidant and an anti-wear agent, and a rust inhibitor, stirring and grinding to obtain a lubricating grease.

[0019] In one or some preferred embodiments, in S2, the preparation of the antioxidant and antiwear agent comprises the following steps:

[0020] Under stirring conditions, tetrahydrated ammonium heptamolybdate or molybdenum trioxide and anhydrous sodium sulfate are added to water in sequence and heated to dissolve; long-chain alkyl o-hydroxybenzoic acid and a catalyst are added to the solution and the temperature is raised for reaction; after cooling, the solution is filtered, extracted and dried to obtain an antioxidant and anti-wear agent.

[0021] As another aspect of the present invention, it relates to the application of the above-mentioned grease for gate hoist bearings in the daily protection and lubrication of gate hoist bearings in sensitive water bodies.

[0022] The grease for gate opening and closing machine bearing prepared by the present invention has the following advantages: 1) outstanding metal protection; 2) molybdenum o-hydroxybenzoate with long-chain alkyl can solve the problem of poor antioxidant capacity of vegetable oil and provide excellent anti-wear performance; 3) outstanding waterproof performance; 4) higher biodegradability.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and claims. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments, and the protection scope of the present invention is not limited by the following embodiments. The sources of the materials mainly involved in the embodiments are shown in Table 1 below, and other materials not shown are conventional commercial products.

[0025] Table 1 Material source description

[0026] Serial number product Specifications / Models factory 1 Ammonium heptamolybdate tetrahydrate MoO3≧54% Taizhou OPT Tungsten and Molybdenum Products Co., Ltd. 2 Molybdenum trioxide MoO3≥99.9% Taizhou OPT Tungsten and Molybdenum Products Co., Ltd. 3 Anhydrous sodium sulfide NaS≧96% Changzhou Zhongyao Chemical Co., Ltd. 4 Dodecyl 2-hydroxybenzoic acid Content ≧95% Zhengzhou Yuhe Food Additives Co., Ltd.

[0027] Example 1

[0028] (1) Preparation of dodecyl o-hydroxybenzoic acid

[0029] In a 2500ml three-necked flask equipped with a stirrer, condenser, gas inlet tube and thermometer socket, add 536g of ammonium heptamolybdate tetrahydrate, 78g of anhydrous sodium sulfide and 300g of water, heat to 50℃ and stir. After dissolving, add 310.0g of dodecyl o-hydroxybenzoic acid and 2g of concentrated sulfuric acid, heat to 150℃ and react for six hours. Cool to about 80℃, filter and wash the solid matter with water, and dry to obtain a brown solid.

[0030] (2) Preparation of grease

[0031] Heat 12kg cottonseed oil and 2500g 12-hydroxy calcium stearate to 150℃ and stir evenly. Cool down and shear and disperse until the temperature drops to about 80℃. Add 700g 100℃ kinematic viscosity of 180mm 2 / s polymethacrylate, 240 g of dodecyl molybdenum o-hydroxybenzoate, 300 g of pentaerythritol monooleate, stirred for 60 minutes, removed from the kettle and ground to obtain the desired grease product.

[0032] Example 2

[0033] (1) Preparation of octadecyl o-hydroxybenzoic acid

[0034] In a 2500ml three-necked flask equipped with a stirrer, condenser, gas inlet tube and thermometer socket, add 536g of ammonium heptamolybdate tetrahydrate, 78g of anhydrous sodium sulfide and 300g of water, heat to 50℃ and stir. After dissolving, add 850.2g of octadecyl o-hydroxybenzoic acid and 3.5g of concentrated sulfuric acid, heat to 150℃ and react for six hours. Cool to about 80℃, filter and wash the solid matter with water, and dry to obtain a brown solid.

[0035] (2) Preparation of grease

[0036] Heat 4 kg soybean oil, 8 kg cottonseed oil and 2500 g calcium stearate to 150°C and stir evenly. Cool and shear until the temperature drops to about 80°C. Add 900 g 100°C kinematic viscosity 180 mm 2 / s polyisobutylene, 480 g octadecyl molybdenum o-hydroxybenzoate, 360 g sorbitan monooleate, stirred for 60 minutes, removed from the kettle and ground to obtain the desired grease product.

[0037] Example 3

[0038] (1) Preparation of dodecyl o-hydroxybenzoic acid

[0039] Put 289g of molybdenum trioxide, 108g of anhydrous sodium sulfide and 300g of water into a 2500ml three-necked flask with a stirrer, condenser, gas inlet and thermometer socket, heat to 50 degrees and stir. After dissolving, add 310.0g of dodecyl o-hydroxybenzoic acid and 2.3g of concentrated sulfuric acid, heat to 150 degrees and react for six hours. Cool down to about 80℃, filter and wash the solid matter with water, and dry to obtain a brown solid.

[0040] (2) Preparation of grease

[0041] Heat 6 kg cottonseed oil, 6 kg castor oil and 2500 g calcium stearate to 150°C and stir evenly. Slowly cool and shear until the temperature drops to about 80°C. Add 900 g 100°C kinematic viscosity 180 mm 2 / s polyisobutylene, 360 g of dodecyl molybdenum o-hydroxybenzoate, 360 g of sorbitan monooleate, stirred for 60 minutes, removed from the kettle and ground to obtain the desired grease product.

[0042] Comparative Example 1

[0043] The difference from Example 1 is that no dodecyl molybdenum o-hydroxybenzoate is added to the grease.

[0044] The following performance tests were performed on Examples 1 to 3 and Comparative Example 1, and the test results are recorded in Table 2 below.

[0045] Table 2 Performance test data

[0046]

[0047]

[0048] From the performance test results recorded in Table 2, it can be seen from Examples 1 to 3 and Comparative Example 1 that:

[0049] The lubricating grease for gate hoist bearings prepared by the present invention has the following advantages: 1) outstanding metal protection; 2) o-hydroxybenzoic acid molybdenum with long-chain alkyl can solve the problem of poor antioxidant capacity of vegetable oil and provide excellent anti-wear performance; 3) outstanding waterproof performance; 4) high biodegradability. When the lubricating grease product prepared by the present invention is used for the bearings of a reservoir gate hoist, the device can run smoothly for one year and the equipment is in normal condition.

[0050] In addition, by comparing the performance test data results of Example 1 with those of Comparative Example 1, the grease product without dodecyl molybdenum o-hydroxybenzoate has a significant increase in the wear of the FE8 bearing, shortens the life of the FE9 bearing from 172 hours to 60 hours, significantly decreases the maximum non-seizure load and sintering load, and increases the wear spot diameter by 34%. Therefore, the inventors believe that the addition of molybdenum o-hydroxybenzoate with a long-chain alkyl group can significantly improve and enhance the bearing lubrication performance.

[0051] The above are only preferred feasible embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Various modifications or applications made according to the above embodiments are within the protection scope of this technical solution.

[0052] Although the specific embodiments of the present invention have been described in detail, it will be understood by those skilled in the art. According to all the teachings disclosed, various modifications and replacements can be made to those details, and these changes are all within the protection scope of the present invention. The full scope of the present invention is given by the attached claims and any equivalents thereof.

Claims

1. Lubricating grease for gate hoist bearings, characterized in that: The lubricating grease comprises the following raw materials by mass percentage: 60-85% of degradable vegetable oil, 8-15% of thickener, 5-8% of waterproofing agent, 2-4% of antioxidant and anti-wear agent, and 1-3% of rust inhibitor.

2. The grease for gate hoist bearing according to claim 1, characterized in that: The kinematic viscosity of the degradable vegetable oil at 100° C. is 60 to 80 mm 2 / s.

3. The grease for gate hoist bearing according to claim 2, characterized in that: The degradable vegetable oil is selected from one or more of castor oil, soybean oil or cottonseed oil.

4. The grease for gate hoist bearing according to claim 1, characterized in that: The thickener is organic calcium carboxylate.

5. The grease for gate hoist bearing according to claim 4, characterized in that: The organic calcium carboxylate is selected from 12-hydroxy calcium stearate and / or calcium stearate.

6. The grease for gate hoist bearing according to claim 1, characterized in that: The waterproofing agent is a high molecular polymer.

7. The grease for gate hoist bearing according to claim 6, characterized in that: The high molecular polymer is selected from polyisobutylene and / or polymethacrylate.

8. The grease for gate hoist bearing according to claim 1, characterized in that: The antioxidant and anti-wear agent is molybdenum o-hydroxybenzoate with a long-chain alkyl group.

9. The grease for gate hoist bearing according to claim 8, characterized in that: The long chain alkyl is selected from C8~C 20 of alkyl.

10. The grease for gate hoist bearing according to claim 1, characterized in that: The rust inhibitor is an ester rust inhibitor.

11. The grease for gate hoist bearing according to claim 10, characterized in that: The ester rust inhibitor is selected from one or more of pentaerythritol monooleate, sorbitan monooleate or polyol ester.

12. A method for preparing the lubricating grease for gate hoist bearings according to any one of claims 1 to 11, characterized in that: The following steps are involved: S1. Weigh each substance according to mass percentage, mix the degradable vegetable oil and the thickener in sequence, heat and stir to obtain material 1; S2, cooling and shearing the material prepared in S1, and then sequentially adding a waterproofing agent, an antioxidant and an anti-wear agent, and a rust inhibitor, stirring and grinding to obtain a lubricating grease.

13. The method for preparing lubricating grease for gate hoist bearing according to claim 12, characterized in that: In S2, the preparation of the antioxidant and antiwear agent comprises the following steps: Under stirring conditions, tetrahydrated ammonium heptamolybdate or molybdenum trioxide and anhydrous sodium sulfate are added to water in sequence and heated to dissolve; long-chain alkyl o-hydroxybenzoic acid and a catalyst are added to the solution and the temperature is raised for reaction; after cooling, the solution is filtered, extracted and dried to obtain an antioxidant and anti-wear agent.

14. Use of the grease for gate hoist bearings as claimed in any one of claims 1 to 11 in the daily protection and lubrication of gate hoist bearings in sensitive water bodies.

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